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Two hours after making out with his mistress at a horror movie at a south-side movie theatre, Mark Twitchell allegedly killed and dismembered Johnny Altinger.

That's what an Edmonton jury heard Tuesday at Twitchell's first-degree murder trial as the former mistress, 35-year-old Traci Higgins, took the witness stand.

Higgins testified she first met Twitchell, 31, in 1997 when they were both students at NAIT and said they went from being friends to becoming "a couple."

They eventually broke up over Twitchell's dishonesty and went on to marry other people and then get divorced.

The Wetaskiwin woman told the jury she and Twitchell reconnected in 2007 and said, despite the aspiring filmmaker being married again, they went out for dinner at a Boston Pizza and ended the date with a "long kiss."

Higgins testified they exchanged messages via Facebook into 2008 and went to see the movie Quarantine at South Edmonton Common on the afternoon of Oct. 10, 2008.

Higgins told the jury the movie was "horrible" and said they talked and made out instead of watching it. When the show ended about 5 p.m., she said she went home alone.

The Oct. 10, 2008, date is when the Crown alleges Twitchell murdered Altinger, 38, after luring him to his rented Mill Woods garage about 7 p.m. on the pretext of seeing a woman he had met on an Internet dating site.

A receipt for the movie was later seized by police from inside Twitchell's car.

Higgins was questioned by prosecutor Avril Inglis about a number of things the jury has heard are in Twitchell's alleged diary - a text document named SKconfessions, which was found buried in the deleted files section of a Toshiba laptop computer discovered in a backpack in Twitchell's seized Pontiac Grand Am car.

Those include the pair spending the night together having sex at her Wetaskiwin home and a tattoo on her back of a Celtic cross intertwined with ivy designed by Twitchell.

Ironically, Twitchell spoke of a similar Celtic tattoo during a police interview when he was describing a man who had supposedly sold him Altinger's car for $40.

Although in the alleged diary, the ex-girlfriend is named Laci, the author describes many things about her which perfectly match what Higgins testified to about herself, including her eye colour, her going to a tanning salon, working out at a gym and taking belly dancing lessons.

The Crown has told the jury the alleged diary is the most significant piece of evidence in the prosecution's case and documents a very detailed account of the author's aspirations to kill and his plan to accomplish this by using Internet dating websites to lure in victims.

The entire SKconfessions document was read to the jury Monday and the Crown alleges its chronicling of both an unsuccessful first attack on a city man and a subsequent killing and dismemberment of a second victim are in fact what was really planned and carried out by Twitchell.

Twitchell is accused of bludgeoning Altinger over the head with a metal pipe and stabbing him to death with a hunting knife. He then allegedly dismembered his body and later disposed of the remains down a city sewer.